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Ejaculation and its disorders.

W K Yeates

    Archivio Italiano Di Urologia, Nefrologia, Andrologia : Organo Ufficiale Dell'Associazione Per La Ricerca in Urologia = Urological, Nephrological, and Andrological Sciences
    |March 1, 1990
    PubMed
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    Ejaculation, the final male sexual function, requires seminal fluid production and propulsion, both influenced by androgens. Correcting androgen deficiency typically restores normal ejaculation function.

    Area of Science:

    • Reproductive Endocrinology
    • Male Sexual Function

    Background:

    • Ejaculation is the terminal event in the male sexual function sequence.
    • Each stage, including ejaculation, is significantly influenced by androgens.

    Purpose of the Study:

    • To elucidate the physiological mechanisms underlying ejaculation.
    • To classify the causes of ejaculatory dysfunction.

    Main Methods:

    • Review of the physiological requirements for seminal fluid production and propulsion.
    • Analysis of the hormonal dependencies, particularly androgens.
    • Examination of the neural control mechanisms involved in ejaculation.

    Main Results:

    • Ejaculation necessitates seminal fluid production (seminal vesicles) and propulsion.

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  • Propulsion involves three phases: seminal vesicle contraction, bladder neck closure (sympathetic T9-L2), and urethral expulsion (somatic S2-S3).
  • Androgen deficiency, stemming from pituitary or testicular issues, impairs seminal fluid production, leading to ejaculatory failure.

    • Conclusions:

    • Normal ejaculation depends on adequate androgen levels for seminal vesicle function.
    • Ejaculatory dysfunction can result from absent seminal vesicles or androgen deficiency.
    • Restoration of androgen levels often resolves ejaculatory problems.